Datasheet

Applications Information
Sample Rate and Performance
The maximum sample rate for the ADC depends on the
selected pulse width, which in turn, determines the ADC
resolution. For instance, if the pulse width is set to 69µs
then the ADC resolution is 15 bits, and all sample rates are
selectable. However, if the pulse width is set to 411µs, then
the samples rates are limited. The allowed sample rates for
both SpO
2
and HR Modes are summarized in the Table 11
and Table 12.
Power Considerations
The LED waveforms and their implication for power sup-
ply design are discussed in this section.
The LEDs in the MAX30102 are pulsed with a low duty cycle
for power savings, and the pulsed currents can cause rip-
ples in the V
LED+
power supply. To ensure these pulses do
not translate into optical noise at the LED outputs, the power
supply must be designed to handle these. Ensure that the
resistance and inductance from the power supply (battery,
DC/DC converter, or LDO) to the pin is much smaller than
1Ω, and that there is at least 1µF of power supply bypass
capacitance to a good ground plane. The capacitance
should be located as close as physically possible to the IC.
Table 11. SpO
2
Mode (Allowed Settings) Table 12. HR Mode (Allowed Settings)
SAMPLES
PER
SECOND
PULSE WIDTH (µs)
SAMPLES
PER
SECOND
PULSE WIDTH (µs)
69 118 215 411 69 118 215 411
50 O O O O 50 O O O O
100 O O O O 100 O O O O
200 O O O O 200 O O O O
400 O O O O 400 O O O O
800 O O O 800 O O O O
1000 O O 1000 O O O O
1600 O 1600 O O O
3200 3200 O
Resolution
(bits)
15 16 17 18
Resolution
(bits)
15 16 17 18
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Maxim Integrated │ 23
MAX30102 High-Sensitivity Pulse Oximeter and
Heart-Rate Sensor for Wearable Health